// 引入AES源码js
import CryptoJS from 'crypto-js'

// 默认的KEY与IV如果没有给
// 秘钥：bGvnMc62sh5RV6zP
// 偏移量：1eZ43DLcYtV2xb3Y
const key = CryptoJS.enc.Utf8.parse('bGvnMc62sh5RV6zP') // 十六位十六进制数作为密钥
const iv = CryptoJS.enc.Utf8.parse('1eZ43DLcYtV2xb3Y') // 十六位十六进制数作为密钥偏移量

// 解密方法
export function Decrypt(word) {
    const encryptedHexStr = CryptoJS.enc.Hex.parse(word)
    const srcs = CryptoJS.enc.Base64.stringify(encryptedHexStr)
    const decrypt = CryptoJS.AES.decrypt(srcs, key, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 })
    const decryptedStr = decrypt.toString(CryptoJS.enc.Utf8)
    return decryptedStr.toString()
}

// 加密方法
export function Encrypt(word) {
    const srcs = CryptoJS.enc.Utf8.parse(word)
    const encrypted = CryptoJS.AES.encrypt(srcs, key, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 })
    return encrypted.ciphertext.toString().toUpperCase()
}


/**
 * sha256加密
 *
 * @param plaintext - 明文
 */
export function sha256(plaintext) {
    return CryptoJS.SHA256(plaintext).toString();
}


/**
 * 加减乘除
 *
 * 
 */class CalcUtil {
    // 两数相加
    calcAdd(num1, num2) {
        var r1, r2, m;
        try {
            r1 = num1.toString().split('.')[1].length;
        } catch (e) {
            r1 = 0;
        }
        try {
            r2 = num2.toString().split('.')[1].length;
        } catch (e) {
            r2 = 0;
        }
        m = Math.pow(10, Math.max(r1, r2));
        return (num1 * m + num2 * m) / m;
    }
    // 两数相减
    calcSub(num1, num2) {
        var r1, r2, m, n;
        try {
            r1 = num1.toString().split('.')[1].length;
        } catch (e) {
            r1 = 0;
        }
        try {
            r2 = num2.toString().split('.')[1].length;
        } catch (e) {
            r2 = 0;
        }
        m = Math.pow(10, Math.max(r1, r2));
        n = r1 >= r2 ? r1 : r2;
        return ((num1 * m - num2 * m) / m).toFixed(n);
    }
    // 两数相乘
    calcMult(num1, num2) {
        var m = 0,
            s1 = num1.toString(),
            s2 = num2.toString();
        try {
            m += s1.split('.')[1].length;
        } catch (e) { }
        try {
            m += s2.split('.')[1].length;
        } catch (e) { }
        return (Number(s1.replace('.', '')) * Number(s2.replace('.', ''))) / Math.pow(10, m);
    }
    // 两数相除
    calcDiv(num1, num2) {
        var t1 = 0,
            t2 = 0,
            r1,
            r2;
        try {
            t1 = num1.toString().split('.')[1].length;
        } catch (e) { }
        try {
            t2 = num2.toString().split('.')[1].length;
        } catch (e) { }
        r1 = Number(num1.toString().replace('.', ''));
        r2 = Number(num2.toString().replace('.', ''));
        return (r1 / r2) * Math.pow(10, t2 - t1);
    }
}

export default new CalcUtil();